[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.052419] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.977886] random: sshd: uninitialized urandom read (32 bytes read) [ 26.435546] random: sshd: uninitialized urandom read (32 bytes read) [ 27.244930] random: sshd: uninitialized urandom read (32 bytes read) [ 27.423147] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. [ 32.948565] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.050664] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 33.058693] PGD 1ae8ed067 P4D 1ae8ed067 PUD 1ae8ec067 PMD 0 [ 33.064592] Oops: 0010 [#1] SMP KASAN [ 33.068386] CPU: 0 PID: 4556 Comm: syz-executor460 Not tainted 4.18.0-rc2+ #121 [ 33.075830] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.085182] RIP: 0010: (null) [ 33.089054] Code: Bad RIP value. [ 33.092447] RSP: 0018:ffff8801d909f758 EFLAGS: 00010246 [ 33.097813] RAX: 0000000000000000 RBX: ffff8801d24c0000 RCX: ffffffff85ec9112 [ 33.105093] RDX: ffff8801d909fab0 RSI: ffff8801d24c0000 RDI: ffff8801aedf4500 [ 33.112370] RBP: ffff8801d909f800 R08: ffff8801ae8a2500 R09: ffffed0035ef3808 [ 33.119645] R10: ffffed0035ef3808 R11: ffff8801af79c043 R12: ffff8801d909fab0 [ 33.126936] R13: ffff8801aedf4500 R14: ffffffff8818a920 R15: ffff8801d96eb300 [ 33.134252] FS: 000000000260b880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 33.142491] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.148375] CR2: ffffffffffffffd6 CR3: 00000001d9761000 CR4: 00000000001406f0 [ 33.155667] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.162940] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.170204] Call Trace: [ 33.172796] ? sock_poll+0x2e1/0x490 [ 33.176519] ? kernel_sendpage_locked+0x120/0x120 [ 33.181375] ? kernel_sendpage_locked+0x120/0x120 [ 33.186210] do_sys_poll+0x74d/0x1180 [ 33.190015] ? compat_core_sys_select+0xb10/0xb10 [ 33.194875] ? __thp_get_unmapped_area+0x180/0x180 [ 33.199817] ? graph_lock+0x170/0x170 [ 33.203624] ? graph_lock+0x170/0x170 [ 33.207433] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.212982] ? find_held_lock+0x36/0x1c0 [ 33.217036] ? poll_initwait+0x180/0x180 [ 33.221117] ? pvclock_read_flags+0x160/0x160 [ 33.225623] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 33.230637] ? timespec64_add_safe+0x204/0x2f0 [ 33.235212] ? nsec_to_clock_t+0x30/0x30 [ 33.239282] ? do_gettimeofday+0x180/0x180 [ 33.243511] ? poll_select_set_timeout+0x156/0x240 [ 33.248453] ? do_restart_poll+0x2e0/0x2e0 [ 33.252675] __x64_sys_poll+0x197/0x530 [ 33.256635] ? __ia32_sys_pselect6+0x270/0x270 [ 33.261222] ? do_syscall_64+0x9a/0x820 [ 33.265184] do_syscall_64+0x1b9/0x820 [ 33.269074] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.274007] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.278937] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.284477] ? retint_user+0x18/0x18 [ 33.288188] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.293052] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.298261] RIP: 0033:0x43fd09 [ 33.301470] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 33.320851] RSP: 002b:00007fff3b68b388 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 33.328581] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09 [ 33.335855] RDX: 0000000000000006 RSI: 0000000000000003 RDI: 0000000020003900 [ 33.343121] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.350500] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401630 [ 33.357778] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000 [ 33.365044] Modules linked in: [ 33.368233] Dumping ftrace buffer: [ 33.371765] (ftrace buffer empty) [ 33.375557] CR2: 0000000000000000 [ 33.379138] ---[ end trace 4e247193d13381fb ]--- [ 33.383987] RIP: 0010: (null) [ 33.387934] Code: Bad RIP value. [ 33.391366] RSP: 0018:ffff8801d909f758 EFLAGS: 00010246 [ 33.396762] RAX: 0000000000000000 RBX: ffff8801d24c0000 RCX: ffffffff85ec9112 [ 33.404081] RDX: ffff8801d909fab0 RSI: ffff8801d24c0000 RDI: ffff8801aedf4500 [ 33.411419] RBP: ffff8801d909f800 R08: ffff8801ae8a2500 R09: ffffed0035ef3808 [ 33.418732] R10: ffffed0035ef3808 R11: ffff8801af79c043 R12: ffff8801d909fab0 [ 33.426086] R13: ffff8801aedf4500 R14: ffffffff8818a920 R15: ffff8801d96eb300 [ 33.433427] FS: 000000000260b880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 33.441808] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.447769] CR2: ffffffffffffffd6 CR3: 00000001d9761000 CR4: 00000000001406f0 [ 33.455138] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.462459] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.469776] Kernel panic - not syncing: Fatal exception [ 33.475721] Dumping ftrace buffer: [ 33.479257] (ftrace buffer empty) [ 33.482949] Kernel Offset: disabled [ 33.486593] Rebooting in 86400 seconds..